One common meaning refers to the process by which an embryo attaches to the uterus of a woman so that she is pregnant. Many think of it as 'sticking.' implantation in humans always occurs when the embryo is between 6-7 days old. A very popular concept on the internet now in 2012, 'implantation bleeding, ' is speculative and mostly not useful.
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2

Yes:
Most often, women don't bleed with implantation. It isn't uncommon to have no sx's or few sx's early in pregnancy. If you missed your period - go ahead and take a home pregnancy test. Take care.
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5

Uterus and embryos:
Failed implantation is common.
An aneuploid embryo, with abnormal chromosomes is likely the cause.
A receptive uterus requires normal structure of the uterine lining and surrounding uterus.
Hormone preparation and timing must be correct.
The transfer procedure itself is sometimes problematic.
Cycle monitoring, medications, and ultrasound are essential. Check with an expert in rei.
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7

Possibly:
If you have active gastritis you may experience symptoms from jostling the abdominal contents with exercise. However if your gastritis is treated and controlled it should not cause problems.
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8

Anything:
A minor pain with nausea could be many things -- also called a "broad differential diagnosis". If it persists, or gets worse, seek out evaluation. Worrisome features: worsening/progressive, more pain, unable to keep down food or fluids, fever, or stopping bowel movements.
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9

See a counselor:
Identify the reasons while your work provokes anxiety and planning on how manage the concerns may help. Also may benefit from desensitization by going to yout work if possible a couple of times before. If anxiety is extreme the use of short acting benzodiazepam for short period may be justified bearing in mild the potential dependence
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10

Have endometriosis:
Assessed by gyn. The nsais's ; Doxycycline may ^ GI upset. A simple way to v nausea is w ginger. You can drink slightly flattened ginger ale or nibble on crystallized ginger. Or pour boiling water over freshly sliced organic ginger ; steep at least 5 min in a covered pot. Sip.
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